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A-Level Biology OCR A

Specific Enzyme Type Active Shape Substrate Explain Catalyses

Enzymes are specific due to uniquely shaped active sites that fit only one substrate and catalyze a single reaction.

Enzymes are specific because their active sites have unique shapes that are complementary to only one specific substrate, thus catalyzing only one reaction.

Front Explain why an enzyme only catalyses one type of reaction.
Back Why enzymes are specific:
  • Different enzymes have differently shaped active sites
  • Each different specific active site shape is complementary to a specific substrate shape
  • This means that each enzyme will only be able to catalyse a specific substrate and therefore only one type of reaction

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